利用离散元法模拟粉末床熔合工艺中的粉末铺展质量研究

IF 3.3 Q2 ENGINEERING, MANUFACTURING
Panagiotis Avrampos, G. Vosniakos
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引用次数: 0

摘要

粉末沉积是基于 PBF 的增材制造工艺的一个非常重要的方面。研究人员通常使用离散元素法 (DEM) 来研究粉末喷涂方法的复杂物理特性。这项工作的重点是振动辅助刮刀粉末重涂。这项工作的目的是将经过实验验证的 DEM 仿真与田口实验设计(DoE)相结合,根据稳健的层质量标准确定最佳喷涂参数。所使用的粉末模型通过休止角和雪崩角模拟-实验交叉检查进行验证。然后,定义了四个标准,即层厚偏差、表面覆盖率、表面均方根粗糙度和真实堆积密度。实验证明,刮刀的平移速度对沉积层的质量起着至关重要的作用。真实堆积密度不受铺展参数的影响。刮刀再涂布机的垂直振动对沉积层的质量有好处。最终,绘制了加权平均质量标准分析图。偏度和峰度被证明是有效的涂层质量指标,与所定义的质量标准的加权平均值呈线性关系。确定了优化这种线性关系的具体权重。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Study on Powder Spreading Quality in Powder Bed Fusion Processes Using Discrete Element Method Simulation
Powder deposition is a very important aspect of PBF-based additive manufacturing processes. Discrete Element Method (DEM) is commonly utilized by researchers to examine the physically complex aspects of powder-spreading methods. This work focuses on vibration-assisted doctor blade powder recoating. The aim of this work is to use experiment-verified DEM simulations in combination with Taguchi Design of Experiments (DoE) to identify optimum spreading parameters based on robust layer quality criteria. The verification of the used powder model is performed via angle of repose and angle of avalanche simulation–experiment cross-checking. Then, four criteria, namely layer thickness deviation, surface coverage ratio, surface root-mean-square roughness and true packing density, are defined. It has been proven that the doctor blade’s translational speed plays the most important role in defining the quality of the deposited layer. The true packing density was found to be unaffected by the spreading parameters. The vertical vibration of the doctor blade recoater was found to have a beneficial effect on the quality of the deposited layer. Ultimately, a weighted mean quality criteria analysis is mapped out. Skewness and kurtosis were proven to function as effective indicators of layer quality, showing a linear relation to the weighted means of the defined quality criteria. The specific weights that optimize this linearity were identified.
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来源期刊
Journal of Manufacturing and Materials Processing
Journal of Manufacturing and Materials Processing Engineering-Industrial and Manufacturing Engineering
CiteScore
5.10
自引率
6.20%
发文量
129
审稿时长
11 weeks
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